Characterization of Ni-Based Superalloy Built by Selective Laser Melting and Electron Beam Melting
Characterization of Ni-Based Superalloy Built by Selective Laser Melting and Electron Beam Melting
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DOI：
10.1007/s11661-018-4769-y
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发表时间：
2018-07
期刊：
影响因子：
--
通讯作者：
Yen-Ling Kuo;Azusa Kamigaichi;K. Kakehi
中科院分区：
文献类型：
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作者：
Yen-Ling Kuo;Azusa Kamigaichi;K. Kakehi
对选择性激光熔化（SLM）和电子束熔化（EBM）制备的合金718试样进行了比较研究。较高的冷却速率导致高的位错密度和枝晶间析出，导致SLM合金的蠕变性能较差。然而，在EBM材料中观察到低的位错密度，分布的δ沉淀和强烈的<001>织构。结果表明，直接时效EBM试样的蠕变寿命接近1100小时，在650℃时与传统铸锻合金相当。
Alloy718 specimens built by selective laser melting (SLM) and electron beam melting (EBM) were comparatively examined. The higher cooling rate resulted in a high dislocation density and interdendritic precipitates, which brought about inferior creep properties in SLM alloys. However, a low dislocation density, distributedδprecipitates and a strong <001> texture were observed in the EBM material. As a result, the creep life of the direct-aged EBM specimen approached 1100 hours and was comparable to that of conventional cast-and-wrought alloys at 650 °C.